$B850/47184: Perform Subtraction
Jump from $BA0F, $E288, $E334:
B850: 20 8C BA JSR $BA8C ; Load FAC#2 From Memory
Jump from $E02D, $E281:
B853: A5 66 LDA $66 ; FAC Sign
B855: 49 FF EOR #$FF
B857: 85 66 STA $66 ; FAC Sign
B859: 45 6E EOR $6E ; AFAC Sign
B85B: 85 6F STA $6F ; Sign of result of Arithmetic Evaluation
B85D: A5 61 LDA $61 ; FAC Exponent
B85F: 4C 6A B8 JMP $B86A ; Perform Addition
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